Malicious PDF — malware analysis report

Static analysis result for SHA-256 113c368b68d5ff49…

MALICIOUS

PDF

48.5 KB Created: 2020-08-09 03:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad3c1f191cdf172e7a696dc19282a524 SHA-1: 037be0df756fa54e7c63a65ccd62d2a848ff1f4d SHA-256: 113c368b68d5ff49a51a57dcef6329d8ff15098fbb12e4801518a22c911bbad2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, flagged as a link farm, with a critical heuristic indicating a redirector to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of the link farm, suggesting the primary purpose is to direct users to potentially harmful content or further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=pares+biomagneticos+por+orden+alfabetico+pdf+gratis
    • http://files.theblackpoolplayroom.com/uploads/1/3/2/8/132815924/346085.pdf
    • http://maluk.lakedevonshirehoa.com/uploads/1/3/2/3/132303374/dagapagej.pdf
    • http://files.donzhenphoto.com/uploads/1/3/1/3/131380786/lilivibunutijud.pdf
    • http://files.cityofhopeks.com/uploads/1/3/0/9/130969841/sokikire.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/74952158463.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65760981278.pdf
    • https://cdn.shopify.com/s/files/1/0436/9268/7528/files/42525090815.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/lazafivukebip.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9016/files/skyrim_quick_loot_crash.pdf
    • https://cdn.shopify.com/s/files/1/0439/6656/2462/files/remuzevokajogevadulima.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/gepuxudud.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/xovuwenoradapokugowituxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5816/6941/files/free_wii_points_generator_no_surveys.pdf
    • https://cdn.shopify.com/s/files/1/0443/4237/8652/files/manual_del_activista_politico.pdf
    • https://cdn.shopify.com/s/files/1/0437/2122/8440/files/aircraft_engine_design_jack_d._mattingly.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/88206400820.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dd2.bin
fe0c484fa991418d43ad9178d0eb17a7380e4a52ac69bc42fb2eccd3141422bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD2 5616 bytes
font_01_sfnt_off000080d4.bin
5922ed8c3e222b0167b64a4c0844d7115af9dccc859462e6ba5353cce9a4321c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D4 16580 bytes

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